Youtor
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=eMKoGYa-6Es
How your eye works, what is wrong with your eyes if you are myopic or hyperopic, and how you can fix them with lenses. • 0:00 - Intro and how a normal eye works • 2:20 - Hyperopia (farsightedness) • 4:29 - Myopia (nearsightedness) • 6:38 - Lens power and review • Myopia is fixed with diverging lenses (negative power) and hyperopia is fixed with converging lenses (positive power). In both cases, the corrective lens is used to make a virtual image at YOUR near or far point that your eye can see. This is why the image distance we use when solving for lens power is always negative.
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